T. Kurosawa

Chiral Charge-Density Waves

We discovered the chirality of charge-density waves (CDW) in 1T-TiSe₂ by using STM and time-domain optical polarimetry. We found that the CDW intensity becomes Ia₁∶Ia₂∶Ia₃ = 1∶0.7 ± 0.1∶0.5 ± 0.1, where Ia(i) (i=1,2,3) is the amplitude of the tunneling current contributed by the CDWs. There were two states, in which the three intensity peaks of the CDW decrease clockwise and anticlockwise. The chirality in CDW results in the threefold symmetry breaking. Macroscopically, twofold symmetry was indeed observed in optical measurement. We propose the new generalized CDW chirality H(CDW) ≡ q₁·(q₂×q₃), where q(i) are the CDW q vectors, which is independent of the symmetry of components. The nonzero H(CDW)-the triple-q vectors do not exist in an identical plane in the reciprocal space-should induce a real-space chirality in CDW system.

4 a × 4 a electronic charge order enhanced in the inhomogeneous pseudogap state of Bi 2 Sr 2 Ca Cu 2 O 8 + δ

Scanning tunneling microscopy/spectroscopy is used to examine the

Separating pairing from quantum phase coherence dynamics above the superconducting transition by femtosecond spectroscopy

4a

Superconducting gap and pseudogap structure in LaFeAsO1-xF x probed by STM/STS

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Damped spin excitations in a doped cuprate superconductor with orbital hybridization

4a

Dynamics of superconducting order parameter through ultrafast normal-to-superconducting phase transition in Bi2Sr2CaCu2O8+delta from multipulse polarization-resolved transient optical reflectivity

electronic charge order (CO) in the pseudogap (PG) state above {\it T}

Nodal gap behavior of Bi2Sr2−xLnxCuO6+δ (Ln = La, Eu) investigated by specific heat measurements

_{\rm c}

STM/STS studies for interplane disorder effects on the electronic states of the Cu–O plane in Bi2201

on Bi